The washer-dryer stopped working this morning & displayed an error
code for which the manual says, "Anti-flooding system has
activated. Disconnect the appliance and contact the service centre."

There's no sign of water leakage anywhere; the towels had gone through
the filling & heating-up stages, but not been fully washed. The
machine is still under warranty, but I'm curious as to how an
"anti-flooding system" works, & whether the technician is just going
to press a secret "reset" button tomorrow.

In article ,
Adam Funk writes:
The washer-dryer stopped working this morning & displayed an error
code for which the manual says, "Anti-flooding system has
activated. Disconnect the appliance and contact the service centre."

There's no sign of water leakage anywhere; the towels had gone through
the filling & heating-up stages, but not been fully washed. The
machine is still under warranty, but I'm curious as to how an
"anti-flooding system" works, & whether the technician is just going
to press a secret "reset" button tomorrow.

I've seen two technologies referred to as flood prevention:

A large tray across the bottom of the system with a float in the
middle, which catches any leaks, and the float triggers an
emergency shutdown, which abandons the cycle and pumps out the
water. Reset in this case consists of draining the water out of
the tray using sponges or tipping the machine, so the float drops
back to normal position. (Don't tip the machine to empty the tray
unless you are sure you aren't tipping the water into something
electrical.) If the machine is left unused for some time after
leaking, the tray can dry up by itself, but crud left behind if
the water was dirty can prevent the float dropping down by itself.

Logic which detects water level dropping unexpectedly, or which
detects the machine taking too long to fill. No reset required
in this case - just restart the machine.

I expect there's a variety of different systems in different
manufacturers' machines.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

Andrew Gabriel was thinking very hard :
Logic which detects water level dropping unexpectedly, or which
detects the machine taking too long to fill. No reset required
in this case - just restart the machine.

Which might be due to low water pressure.

--
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk

In article ,
Harry Bloomfield writes:
Andrew Gabriel was thinking very hard :
Logic which detects water level dropping unexpectedly, or which
detects the machine taking too long to fill. No reset required
in this case - just restart the machine.

Which might be due to low water pressure.

Which is one reason why machines specify a minimum pressure
(another being that the electric water valves used in
them require a minimum pressure to reliably shut off).

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

On 01/10/2012 14:16, Andrew Gabriel wrote:
In article ,
Adam Funk writes:
The washer-dryer stopped working this morning & displayed an error
code for which the manual says, "Anti-flooding system has
activated. Disconnect the appliance and contact the service centre."

There's no sign of water leakage anywhere; the towels had gone through
the filling & heating-up stages, but not been fully washed. The
machine is still under warranty, but I'm curious as to how an
"anti-flooding system" works, & whether the technician is just going
to press a secret "reset" button tomorrow.

I've seen two technologies referred to as flood prevention:

A large tray across the bottom of the system with a float in the
middle, which catches any leaks, and the float triggers an
emergency shutdown, which abandons the cycle and pumps out the
water. Reset in this case consists of draining the water out of
the tray using sponges or tipping the machine, so the float drops
back to normal position. (Don't tip the machine to empty the tray
unless you are sure you aren't tipping the water into something
electrical.) If the machine is left unused for some time after
leaking, the tray can dry up by itself, but crud left behind if
the water was dirty can prevent the float dropping down by itself.

Logic which detects water level dropping unexpectedly, or which
detects the machine taking too long to fill. No reset required
in this case - just restart the machine.

I expect there's a variety of different systems in different
manufacturers' machines.

One of the Miele ones has a hose within a hose and an electrically
operated stop valve at the tap end of the hose. So if the hose springs a
leak it is contained, and also triggers the shut off valve.


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

In article ,
John Rumm writes:
One of the Miele ones has a hose within a hose and an electrically
operated stop valve at the tap end of the hose. So if the hose springs a
leak it is contained, and also triggers the shut off valve.

That seems to be quite common. Seem some Whirlpools like this too,
and if something leaks into the outer hose, it runs back into the
bottom flood tray, triggering the float.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

On 01/10/2012 14:16, Andrew Gabriel wrote:
A large tray across the bottom of the system with a float in the
middle, which catches any leaks, and the float triggers an
emergency shutdown

Our dishwasher did this for a pinprick leak. Annoyingly I couldn't fix
the damn leak on a polythene thingy (1), and had to buy a new bit. Of
course I can say that here, as the unreasonably expensive bit was less
than half a call out charge

Andy

(1) Anyone know a glue that will stick to polythene in the presence of
hot dishwasher detergent? If you do, please don't tell me...

On 01/10/2012 14:16, Andrew Gabriel wrote:
In article ,
Adam Funk writes:
The washer-dryer stopped working this morning & displayed an error
code for which the manual says, "Anti-flooding system has
activated. Disconnect the appliance and contact the service centre."

There's no sign of water leakage anywhere; the towels had gone through
the filling & heating-up stages, but not been fully washed. The
machine is still under warranty, but I'm curious as to how an
"anti-flooding system" works, & whether the technician is just going
to press a secret "reset" button tomorrow.

I've seen two technologies referred to as flood prevention:

A large tray across the bottom of the system with a float in the
middle, which catches any leaks, and the float triggers an
emergency shutdown, which abandons the cycle and pumps out the
water. Reset in this case consists of draining the water out of
the tray using sponges or tipping the machine, so the float drops
back to normal position. (Don't tip the machine to empty the tray
unless you are sure you aren't tipping the water into something
electrical.) If the machine is left unused for some time after
leaking, the tray can dry up by itself, but crud left behind if
the water was dirty can prevent the float dropping down by itself.

Logic which detects water level dropping unexpectedly, or which
detects the machine taking too long to fill. No reset required
in this case - just restart the machine.

I expect there's a variety of different systems in different
manufacturers' machines.

One which I have seen on a dishwasher is a microswitch held closed by a
sponge. If the sponge gets wet it softens and allows the switch to open.
In this case, the sponge had gradually deformed under the pressure of
the microswitch over the years. Simply reversing the sponge solved the
problem for the rest of the life of the dishwasher.

SteveW

In article , Andy Champ
writes
On 01/10/2012 14:16, Andrew Gabriel wrote:
A large tray across the bottom of the system with a float in the
middle, which catches any leaks, and the float triggers an
emergency shutdown

Our dishwasher did this for a pinprick leak. Annoyingly I couldn't fix
the damn leak on a polythene thingy (1), and had to buy a new bit. Of
course I can say that here, as the unreasonably expensive bit was less
than half a call out charge

Rigid plastic structure? Drill through the pinhole and seal with a
rubber washer under the head of a setscrew inside, washer & nut outside.
--
fred
it's a ba-na-na . . . .

On 2012-10-01, Andrew Gabriel wrote:

In article ,
Adam Funk writes:
The washer-dryer stopped working this morning & displayed an error
code for which the manual says, "Anti-flooding system has
activated. Disconnect the appliance and contact the service centre."

There's no sign of water leakage anywhere; the towels had gone through
the filling & heating-up stages, but not been fully washed. The
machine is still under warranty, but I'm curious as to how an
"anti-flooding system" works, & whether the technician is just going
to press a secret "reset" button tomorrow.

I've seen two technologies referred to as flood prevention:

A large tray across the bottom of the system with a float in the
middle, which catches any leaks, and the float triggers an
emergency shutdown, which abandons the cycle and pumps out the
water. Reset in this case consists of draining the water out of
the tray using sponges or tipping the machine, so the float drops
back to normal position. (Don't tip the machine to empty the tray
unless you are sure you aren't tipping the water into something
electrical.) If the machine is left unused for some time after
leaking, the tray can dry up by itself, but crud left behind if
the water was dirty can prevent the float dropping down by itself.

That's the one. The technician found enough water in the bottom to
trip the float, but couldn't make it leak. (There are some secret
ctrl-alt-F1-type combinations that do diagnostic things like spin as
fast as possible with water running in.) He thinks I put too much
detergent in on the 95° cycle & filled the drum with foam so the rinse
water overflowed from the inlet.

On 01/10/2012 23:41, fred wrote:
Rigid plastic structure? Drill through the pinhole and seal with a
rubber washer under the head of a setscrew inside, washer & nut outside.

Concertina pipe.

Andy

In article , Andy Champ
writes
On 01/10/2012 23:41, fred wrote:
Rigid plastic structure? Drill through the pinhole and seal with a
rubber washer under the head of a setscrew inside, washer & nut outside.

Concertina pipe.

Not a chance then, nothing will stick to something that slippery and
flexible so replacement really was your only choice.
--
fred
it's a ba-na-na . . . .